Why does he always want to have phone sex with me?

I'm having a hard time figuring out if this guy really wants to be with me like he says he does or does he just want me for sex. We have never had...
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I'm having a hard time figuring out if this guy really wants to be with me like he says he does or does he just want me for sex. We have never had sex...he has talked about the future with me. It doesn't matter the time of the day he always expects me to drop everything just to do that...what does this mean?